Two Jetstar pilots have been stood down after a flight was diverted from Christchurch and forced to land in Auckland earlier this month.
Bad weather and an issue with the 'flap position' caused the change of route on June 3.
The airline insists the safety of the flight was never at risk but the pilots have been stood down while an investigation is carried out.
Jetstar says the flaps on the A320 aircraft flying from Sydney to Christchurch on June 3 may have been in the wrong position.
But the plane landed safely in Auckland after diverting from Christchurch because of poor weather.
"The aircraft did go around at Christchurch before landing in Auckland. A go-around due to inclement weather is a common safety procedure," a Jetstar spokesman told NZ Newswire in a statement.
"The crew reported a flap position issue during the go around and the event has been assessed internally.
"We take anything that happens in the cockpit very seriously, we are assessing the issue and our initial findings show that the fundamental safety of the flight was never at risk."
A spokesman for Australia's Civil Aviation Safety Authority said it was reviewing Jetstar's investigation of the incident.
Fairfax's BusinessDay said the two pilots had been stood down as a result of the incident, but Jetstar offered no confirmation in its statement.
"Jetstar has well-trained pilots operating some of the most modern aircraft available. And we work in one of the most tightly regulated industries anywhere in the world, which is as it should be."
NZN / RadioLIVE